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17 Review(s)
| 10 answered questions
Model: CISCO2921/K9 Cisco 2921 Router ISR G2
Detail: Cisco 2921 Router w/3 GE,4 EHWIC,3 DSP,1 SM,256MB CF,512MB DRAM,IPB
List Price: US$4,875.00
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Overview (CISCO2921/K9)

The Cisco 2921 router, supporting voice module, is designed for small offices.

Quick Specs

Figure 1 shows the appearance of the CISCO2921/k9.


Table 1 shows the Quick Specs of the CISCO2921/k9.

Product Code


Rack Units



3 integrated 10/100/1000 Ethernet ports (RJ-45 only)

Expansion Slot(s)

2 service module slot

1 Internal Service Module slot

3 onboard digital signal processor slots

4 Enhanced high-speed WAN interface card (EHWIC) slots


512 MB (installed) / 2 GB (max)

Flash Memory

256 MB (installed) / 8 GB (max)


47 cm x 43.8 cm x 8.9 cm

Package Weight

18.93 Kg

Product Details

Figure 2 shows the front panel of the Cisco 2921 router.

CISCO2921/K9 Front LED


①AC OK  ②On/Off switch  ③AC power connector  ④Optional RPS adapter(blank panel shown)  ⑤LEDs area

Table 2 shows the LEDs area description.





Solid green

Solid green indicates normal operation.

Blinking green

System is booting or is in ROM monitor mode.


System error.


Power is off or system board is faulty.



Solid or blinking indicates packet activity between the forwarding and routing engine and any I/O port.


No packet transfers are occurring.



PoE is available.


Power supply is not supplying PoE power.



System is running on external RPS power supply.



System is running.


System is not running.

Figure 3 shows some LEDs on the back panel of the Cisco 2921 router.

CISCO2921/K9 Back LED


 ① Compact flash 0 and 1 (0, right)  ② ISM    ③ PVDM3 0,1 and 2 (0 right)  ④ EN (Enable USB console) ⑤ EN (Enable RJ-45 console)  

⑥ SFP S  ⑦ SFP EN  ⑧ S (Speed)  ⑨ L (Link)

Table 3 shows the description of these LEDs on the back panel.





CompactFlash 1


Flash memory is busy.

Back Panel


Initialized with error.

Blinking Green then turns off

CompactFlash is ready for removal.

CompactFlash 0


Flash memory is busy.

Back Panel


Initialized with error.

Blinking Green then turns off

CompactFlash is ready for removal.

S (Speed)

1 blink + pause

GE port operating at 10 Mb/s.

Back Panel

2 blink + pause

GE port operating at 100 Mb/s.

3 blink + pause

GE port operating at 1000 Mb/s.

L (Link)


GE link is established.

Back Panel


No GE link is established.

EN (RJ-45 console port)


The RJ-45 console port is active.

Back Panel

EN (USB serial console port)


The USB console port is active.

Back Panel




Back Panel


Initialized with error.


Not installed.


Blinking green

Blinking frequency indicates port speed.

Back Panel



Not present.

Back Panel


Present and enabled.


Present with failure.

PVDM 0, 1 and 2


PVDM is initialized.

Back Panel


PVDM is detected but not initialized.


No PVDM installed.

Figure 4 show the expansion slots and ports on the back panel.

The Cisco 2921/K9 supports expansion functions with modules and cards.

CISCO2921/K9 Back Slot


① Compact flash 0 and 1 (0, right)         ② EHWIC 0,1,2 and 3 (0, far right)        ③ USB serial port 

④ RJ-45 serial console port                    ⑤ AUX port                                                ⑥ SFP

⑦ 10/100/1000 Ethernet port (GE 0/1 and GE 0/2)                                                  ⑧ 10/100/1000 Ethernet port GE 0/0    

⑨ Ground                                                    ⑩ USB 0 and 1 (1, top)                           ⑪ Service module slots   

Figure 5 shows the unboxing view of CISCO2921/K9.


Cards and Licenses

Table 4 shows some recommended models for this router.




Enhanced EtherSwitch Service Module, L2/L3 switching, 16* 10/100/1000 GE ports, Enhanced POE, Cisco EnergyWise technology


Enhanced EtherSwitch Service Module, L2/L3 switching, 24 * 10/100/1000 GE ports, Enhanced POE, Cisco EnergyWise technology


Cisco Voice/WAN Card VWIC3-2MFT-G703


2-Port Serial WAN Interface Card Cisco Router High-Speed WAN Interface card


Cisco 1900, 2900, 3900 Router EHWIC WAN Card EHWIC-1GE-SFP-CU


Four port 10/100/1000 Base-TX Gigabit Ethernet switch interface card for Cisco 1900 2900 3900 Routers


Internal Services Module (ISM) with Services Ready Engine


16-channel high-density voice DSP module


256MB to 1GB Compact Flash Upgrade for Cisco 1900,2900,3900


256MB to 2GB Compact Flash Upgrade for Cisco 1900,2900,3900


256MB to 512MB CF Upgrade for Cisco 1900,2900,3900 ISR


256MB to 4GB Compact Flash Upgrade for Cisco 1900,2900,3900


1GB USB Flash Token




Cisco 2900 License L-SL-29-SEC-K9 Security E-Delivery PAK for Cisco 2901-2951


Cisco Application Experience License ISR 2900 Series - includes licenses for: AppX, DATA and WAASX


Cisco 2900 License L-SL-29-SECNPE-K9 SEC No Payload Encryption E PAK for Cisco 2901-2951


Cisco 2900 License L-SL-29-UC-K9= Unified Communication E-Delivery PAK for Cisco 2901-2951

Datasheet Download

Cisco 2900 Series Router Datasheet.pdf

Get More Information

Do you have any question about the Cisco 2921 router?

Contact us now via Live Chat or


Specification (CISCO2921/K9)

CISCO2921/K9 Specification


Device Type


Enclosure Type

Rack-mountable - modular - 2U

Connectivity Technology


Data Link Protocol

Ethernet, Fast Ethernet, Gigabit Ethernet

Network / Transport Protocol

IPSec, L2TPv3

Routing Protocol

OSPF, IS-IS, BGP, EIGRP, DVMRP, PIM-SM, static IP routing, IGMPv3, GRE, PIM-SSM, static IPv4 routing, static IPv6 routing, policy-

based routing (PBR), MPLS, Bidirectional Forwarding Detection (BFD), IPv4-to-IPv6 Multicast

Remote Management Protocol



Firewall protection, VPN support, MPLS support, Syslog support, IPv6 support, Class-Based Weighted Fair Queuing (CBWFQ),

Weighted Random Early Detection (WRED), Web Services Management Agent (WSMA), NetFlow

Compliant Standards

IEEE 802.3, IEEE 802.1Q, IEEE 802.3af, IEEE 802.3ah, IEEE 802.1ah, IEEE 802.1ag, ANSI T1.101, ITU-T G.823, ITU-T G.824


512 MB (installed) / 2 GB (max)

Flash Memory

256 MB (installed) / 8 GB (max)

Status Indicators

Link activity, power

Expansion and Connectivity


3 x 10Base-T/100Base-TX/1000Base-T - RJ-45 ¦ Management : 1 x console - RJ-45 ¦ Management : 1 x console - mini-USB Type B ¦

Serial : 1 x auxiliary - RJ-45 ¦ USB : 2 x 4 pin USB Type A ¦ 1 x SFP (mini-GBIC)

Expansion Slot(s)

4 (total) / 4 (free) x HWIC ¦ 3 (total) / 3 (free) x PVDM ¦ 2 (total) / 1 (free) x CompactFlash Card ¦ 1 (total) / 1 (free) x expansion slot


Power Device

Power supply - internal

Voltage Required

AC 120/230 V ( 50/60 Hz )


Dimensions (W × D × H)

17.2 × 18.5 × 3.5 in (47 x 43.8 x 8.9 cm)

Package Weight

41.7 lbs (18.93 Kg)


29.1 lbs (13.2 Kg)

Rack Mounting Kit


Compliant Standards

CISPR 22 Class A, CISPR 24, EN55024, EN55022 Class A, EN50082-1, AS/NZS 60950-1, ICES-003 Class A, CS-03, R&TTE,

FCC CFR47 Part 15, EN300-386, UL 60950-1, IEC 60950-1, EN 60950-1, BSMI CNS 13438, AS/NZS 3548 Class A, CAN/CSA

C22.2 No. 60950-1, VCCI V-3, EN 61000, TIA/EIA/IS-968

Software / System Requirements

OS Provided

Cisco IOS IP Base

Manufacturer Warranty

Service & Support

90 days warranty

Service & Support Details

Limited warranty - 90 days

Environmental Parameters

Min Operating Temperature

32 °F

Max Operating Temperature

104 °F

Humidity Range Operating

10 - 85%


Faq (CISCO2921/K9)

Does this router Cisco 2921/K9 come with LAN port modules?

NO, as for 2921 it comes with no LAN port. But for routers more advanced than Cisco2901 support SM slots, you can chose SM, like SM-ES3G-16-P, support Layer2/3 ports can you use them as LAN ports.

Are these2921/k9, 3945/k9 have the same IOS?

NO, they have the different part number but their features are similar.

I've got a 2921 used to connect to physical sites over a WAN connection (BT Fibre). I was wondering if someone can tell me (or point me to) what speeds the 2921 can support in terms of throughput. We do dynamic routing but we don't so any encryption or NAT. It says 2921 can support 245.76 mbps

I purchased brand new router from Cisco 2921 also I purchased an SFP-Transceiver (GLC-SX MM) along with this Router. However the Router does not Supporting SFP Transceiver. Currently the Router is having Universal IOS: “c2900-universalk9-mz.SP151-3.T1.bin”. Kindly provide the IOS i woud like to use. Is the same is IOS compatibility, thanks.

MAJOR untested bug in IOS 15.0(1) M3 which was the default image when we bought the devices *** AVOID IOS 15.0 series *** There are several bugs related to SFPs like: Does does recognize SFP does not recognize some EHWIC cards such as, but not limited to EHWIC 1GE-SFP-CU.

What is the exact HSEC-k9 license?

The HSEC-K9 license removes the curtailment enforced by the U.S. government export restrictions on the encrypted tunnel count and encrypted throughput. HSEC-K9 is available only on the Cisco 2921, Cisco 2951, Cisco 3925, Cisco 3945, Cisco 3925E, and Cisco 3945E. With the HSEC-K9 license, the ISRG2 router can go over the curtailment limit of 225 tunnels maximum for IP Security (IPsec) and encrypted throughput of 85-Mbps unidirectional traffic in or out of the ISR G2 router, with a bidirectional total of 170 Mbps. The Cisco 1941, 2901, and 2911 already have maximum encryption capacities within export limits.

What countries are classified license-free zones?

Countries belonging to the EU license-free zone include Australia, Austria, Belgium, Bulgaria, Canada, Cypress, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Japan, Latvia, Lithuania, Luxembourg, Malta, Netherlands, New Zealand, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey, United Kingdom, and the United States.

We know the ISR2 series included VPN hardware acceleration but there is a "HSEC" which included an "advanced" encryption card. We are just trying to get my head around it. Is the HSEC bundle really needed over the standard SEC bundle? Now we need to support a 50meg Internet connection with 4 Site-to-Site VPNs and use of the firewall, NAT and QOS on each router. We are looking at the Cisco2921-SEC/K9 bundle. Does this sound about right?

If your internet link is 50mb, then a 2921 (non-HSEC) can handle the encryption/decryption. The standard SEC license comes with a software-based rate limiter of 85 Mbps each way. If the protocol does not handle loss/retransmissions very well, throughput can easily plummet. Testing in a lab environment with two Cisco 2921s, I saw speeds drop to 25 Mbps. Also info on the HSEC license can be found here in regards to what it is and what t does for you. It allows for addition through for encrypted traffic NASA higher number of VPN tunnels.

We have installed a 60 day license for the security k9. The Cisco 2900 router we got. And we are trying to set up a client to site vpn on this and it still does not recognize the ipsec and isakmp commands. Is there a command I need to do to now enable ipsec and isakmp?

Make sure your Cisco 2900 took the license, issue 'show license' and verify. Show license shows that it is in there and active. I rebooted and it still throws an error whenever i issue crypto ipsec or crypto isakmp Here is your problem: from "show license" License State: Active, Not in Use, EULA accepted "not in use" is the key. Try using "license modify priority securityk9 high" or the config command "license boot module c2900 tech securityk9" to make this feature in use, rather than not in use.

 Are there any restrictions with the memory modules for the new platforms?

The Cisco Series Integrated Services Routers ship with higher default memory (both DRAM and Compact Flash) than today's integrated services routers. The Cisco 2951, 3925, 3925E, 3945, and 3945E routers have two modular dual-inline-memory-module (DIMM) slots for error-correcting code (ECC) double-data-rate 2 (DDR2) synchronous dynamic random access memory (SDRAM)-each slot capable of integrating 512 MB to 2 GB DIMM.

Which AC option should I choose? Does it support AC + PoE option? and which should I choose?

PWR-2921-51-AC is the right AC option. And it supports AC + PoE option, PWR-2921-51-POE is the one you should choose.

Shipping & Payment


Cargo will be delivered within 1 day after payment arrived. Tracking Number will be offered once delivery done.

Delivery OptionsEstimated Delivery Time
DHL 2-4 business days
Fedex 2-4 business days
Hong Kong EMS 5-10 business days
Hong Kong Air Parcel 10-20 business days
By Sea 10-20 business days


Above mentioned information are just for your reference only,we will keep you posted for the tracking delivery schedule.There are two delivery options available for by air and by sea:

Deliver to port: is responsible for transporting goods to port. All subsequent customs and transportation fees are the
responsibility of the buyer. Router-switch will recommend trustworthy local freight forwarders to can facilitate the progress under buyer's permission and at buyer's expense.

Deliver to door: will quote all destination charge prior once we have confirmed order. is responsible for transporting goods to door after you have made the payment.

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Return Material Authorization (RMA) Process

Standard Hardware Warranty Policy:

Original new sealed Cisco product: 1 Year
Used Cisco product: 3 Month

The Support Contacts:

If your Cisco products failed, you must contact your sales representative to verify product failure. If the problem still can't correct by remote support methods i.e. email or phone support, the RMA procedure will issue.


Customer Reviews

4.8 5
4.8 (17 reviews)
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Share your thoughts with other customers?

Posted on 8/1/2017
Verified Buyer
worth the price

It's worth the price you pay. And I need a little more time to test whether it's good to use.

Posted on 7/20/2017
Verified Buyer

Router works very well, made the connections in my house a lot faster, as we have many devices all being used at once. Highly recommend it, good price as well.

Posted on 3/22/2017
Verified Buyer
Pretty good

Pretty good

Posted on 12/21/2016
Verified Buyer
Scelerisque novum productum

Item C% Cisco The original is novus, nova sarcina signati

Posted on 11/21/2016
Verified Buyer
operatur perfecte non repeat mos issues.I conservet.

operatur perfecte non repeat mos issues.I conservet.

Posted on 11/20/2016
Verified Buyer
CCIE Technical Support

Vae, bonum auxilium. Nescio quo enim est ipsum iter ipsi auctori CCIE artis ministerium nobis exempla eligere aptissima nostris, nisi tempus, nisi pecunia possideri

Posted on 11/19/2016
Verified Buyer
bonum est qualitas, esset melius, si modo quantitas

Sed bona qualitas, quantitas non est meus mos postulo L frusta potes ministramus?

Posted on 11/2/2016
Verified Buyer

Tempus plumbo diutius opinione. Feliciter bona pretium tellus.

Posted on 12/13/2015
Verified Buyer
Works perfectly

It works perfectly.

Posted on 10/11/2015
Verified Buyer
All parts are included

I received it with new sealed box. All parts are incuded.

Posted on 7/6/2015
Verified Buyer
Very Polite

Very polite and feeback is extremely quick

Posted on 3/21/2015
Verified Buyer

Great condition and good for my lab

Posted on 9/28/2014
Verified Buyer
Good Price

You offer a good discount. This price is lower than I have seen.

Posted on 9/23/2013
Verified Buyer
Cisco 2921

I\'ve installed well over 100 of these routers, I can only identify one hardware failure in what amounts to several hundred uptime-years. Really excellent!

Posted on 9/23/2013
Verified Buyer

Hi, I need a router doing simple SNAT. There will be around 500 to 2000 users behind the device. What NAT performance can be expected?
Btw, there will be no additional service running, so simple SNAT, no ACL, no firewall.

Posted on 7/26/2011
Verified Buyer
Good Cisco Router for our school

Good Cisco 2900 router from you for our school. A 2900 is actually a switch. We probably have a dozen or so to support the 100-150 users. Great!

Posted on 5/28/2010
Verified Buyer
we need more information

plz post more information for products

Ok,thanks for your advise.

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